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Influence of Damp Air on Metal Film and its Countermeasures

Views: 184     Author: Site Editor     Publish Time: 2020-06-19      Origin: Site

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From the end of the 1990s, a new metal film Al-Zn composite film has developed rapidly, because it concentrates the advantages of both: the oxidation resistance is stronger than the pure Zn metal film, and the attenuation resistance is better than Al metal film capacitors. In the Al-Zn composite film, the Al content is less than 10%, and its function is sensitization and priming to facilitate the deposition of Zn. Al penetrates the surface of Zn to form a protective layer of Al2O3, which plays a protective role. 

The Effect of Moist Air on the Zn-Al Film

We have done this kind of experiment. After immersing the vaporized Al metal film in water for 24h, there is no obvious change, which shows that the Al metal film is more stable to water. Similarly, the vapor-deposited Al-Zn metal film is directly in contact with water, and as a result, a blank spot can appear within a few seconds. After a few minutes later, the thin film is almost transparent, and the Al-Zn metal layer is completely absent, which fully illustrates the sensitivity of the Al-Zn metal film to water. We have dissected early failure products many times, most of which were caused by oxidation of the metal film. Therefore, we must prevent the oxidation and corrosion of the Al-Zn film in the production process. The key is to minimize the humidity of the production environment.


The Form of Water Vapor

To reduce the amount of water vapor in the air, we need to discuss the form and law of water vapor in the air. The water vapor in the air exists in the form of gas. In fact, the air in our surroundings should be humid air. Humidity we usually say refer to the relative humidity. It just represents the relative proportion with saturated water vapor. Saturated water vapor pressure is defined as: when wet air and liquid water are in a saturated state, the pressure of water vapor in the air at this time is the saturated water vapor pressure at this temperature.


Relative humidity is defined as the percentage of the ratio of the actual partial pressure of water vapor in the air to the saturated pressure of water at the same temperature. Among them, Pv is the actual water vapor pressure in the air, and Pw is the saturated water vapor pressure at this temperature. Experiments and data show that the saturated water vapor pressure is related to temperature. It is a function related to temperature. The higher the temperature, the higher the rate of water evaporation and the higher the vapor pressure when it reaches saturation.

Condensation and Prevention of Water Vapor

If the component moves from low temperature to high temperature and humid air, we will soon see some small water droplets on its surface. This is because the ambient air temperature is high and the water content is high. When contacting the surface of the low-temperature component, because the surface temperature of the component is lower than the dew point temperature of the air, the water vapor in the air condenses into small water droplets, which is dew condensation.

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In order to avoid the phenomenon of condensation, one is to avoid the temperature difference when moving from low temperature to high temperature, and the maximum temperature difference can be obtained according to the absolute temperature at high temperature; the second is to reduce the humidity at high temperature, as long as we reduce the relative humidity of the environment at the temperature of 30 ° C to 50%, we can avoid the phenomenon of condensation, so as long as we take scientific and effective methods in the production process, the prevention of condensation is not difficult. Therefore, a good Dehumidifiers can help a lot in this process. 

Pro230 Dehumidifier for Metal Film


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